Thyroid gland

The thyroid gland produces thyroxine and triiodothyronine, hormones that affect metabolism, body temperature, pulse, weight, mood, skin, hair, bowel function and reproduction. Iodine, tyrosine, selenium, iron and pituitary regulation are needed for normal function.

Thyroid problems may cause fatigue, feeling cold, palpitations, anxiety, weight change, constipation, hair loss, cycle changes or neck enlargement. Symptoms are nonspecific, so lab testing matters.

Keto And The Thyroid

On a low-carb diet, T3 sometimes falls, especially with a large calorie deficit. This is not always disease, but weakness, coldness, hair loss or cycle disruption should prompt checking TSH, free T4, free T3 when appropriate, antibodies and ferritin.

What Not To Do

Thyroid hormones or high-dose iodine should not be self-prescribed. Nodules, pregnancy, autoimmune thyroiditis or marked symptoms need clinician guidance.

The practical conclusion: the thyroid requires context and testing, not attempts to “speed up metabolism” with supplements.

Common Mistakes

A common mistake is blaming every weight plateau on the thyroid without labs, or doing the opposite and ignoring clear symptoms. The thyroid does affect metabolism, but weight also depends on calories, sleep, activity, medications, cycle, fluid retention and stress.

Another mistake is taking iodine or thyroid hormones without supervision. In autoimmune thyroiditis, nodules and pregnancy this can cause harm. The right approach is to identify whether a disorder exists and then treat the cause.

Ferritin, Protein And Thyroid-Like Symptoms

Even with normal thyroid hormones, low ferritin, low protein intake or chronic poor sleep may cause weakness and feeling cold. Symptoms “like thyroid” do not always mean thyroid disease.

Nutrients are needed for hormone synthesis and action, but excess supplements do not speed up a healthy gland. The goal is to correct deficiencies, not stimulate the organ without indication.